Enhancement of luminous efficiency by hybrid structure for warm white light-emitting diodes
2014/7 Chin-Wei Sher1, Kuo-Ju Chen, Chien-Chung Lin, Hau-Vei Han, Bing-Cheng Lin, Kuan-Yu Wang, Jie-Ru Li,Mei-Tan Wang, Jung-Min Hwang, Min-Hsiung Shih, Chien-Chung Fu and Hao-Chung Kuo
Abstract
This study demonstrates the hybrid structure with high lumen efficiency and uniform
angular-dependent correlated color temperature (CCT) for warm white LED. Compared
to the conventional structures, the hybrid structure combines the advantage of the two
different fabrication methods including dispense and pulse spray method together,
which can produce the high quality lighting source. The experimental results indicate
that the hybrid structure yielded higher lumen efficiency than conventional phosphor
structure because of the gradual refractive index difference from the coating layer to
the dispense layer. Moreover, the CCT deviations of the hybrid phosphor structure
could be reduced to 65 K in range of −70 to 70 degrees. This is attributed to the
uniform color mixing of the blue, yellow and red band in the hybrid phosphor
structure. In addition, the chromaticity coordinate shift compared to the hybrid
structure with the dispense structure are almost the same at a current regulation from
20 mA to 500 mA. We believe that the technology of the hybrid structure with high
lumen efficiency and uniform angular-dependent CCT is suitable for in the general
lighting application.
Keywords: White light-emitting diodes; Hybrid; Phosphor; Package
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- International Journals (國際期刊):
Chin-Wei Sher, Kuo-Ju Chen, Chien-Chung Lin, Hau-Vei Han, Bing-Cheng Lin, Kuan-Yu Wang, Jie-Ru Li, Mei-Tan Wang, Jung-Min Hwang, Min-Hsiung Shih, Chien-Chung Fu and Hao-Chung Kuo, Enhancement of luminous efficiency by hybrid structure for warm white light-emitting diodes, Journal of Solid State Lighting, 2014, 1:9
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